Abstract
Mechanically polished plates of natural diamond of the IIa and Ia types were investigated by the microwave photoconductivity (MW PC), conventional (direct-current or, more precisely, low-frequency) photoconductivity (LF PC), and optical-absorption techniques. It is shown that the polycrystalline structure of the samples and high spatial inhomogeneity of the impurity defect distribution provide differences in MW PC and LF PC spectra. It is assumed that nonequilibrium holes in the illuminated diamond are trapped by the crystallite boundaries, while free electrons “oscillate” within the crystallites during their lifetime. The influence of chemical and mechanical treatment on the LF and MW PC is demonstrated.
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